摘要
首先分析了三元阵的信号相位匹配原理抵消相干干扰的性能 ,指出三个阵元接收干扰谱幅度的不一致性将严重影响该方法的性能 ;接着将基阵接收的随机噪声等效为干扰频谱的起伏 ,因此 ,抑制随机噪声可以提高抵消相干干扰的性能 ;最后根据通常基阵的阵元都大于三的这一实际情况 ,提出两种充分利用基阵冗余阵元来减小随机噪声影响、提高抵消干扰性能的方法 :三子阵法和最小二乘法。仿真结果证明了该方法的有效性。
The effectiveness of the signal phase-matching method proposed by us in Ref.7 for suppressing interference degrades seriously when interference spectrum amplitudes fluctuate significantly or when received signals contain significant random noise. We now propose two methods that can reduce such degradation. Section 2 advances and proves our viewpoint that we can view addictive noise as the fluctuation of interference spectrum amplitude and thus suppressing the noise can improve the performance of interference suppression. On the basis of this important viewpoint and keeping in mind that the number of practical array elements is commonly more than three, we propose three sub-array method (subsection 3.1) and least squares method (subsection 3.2) to suppress the random noise by exploiting redundant elements of array. Computer simulation results, given in Fig.2 and Tables 1 and 2, show preliminarily the effectiveness of the proposed two methods.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2002年第4期642-646,共5页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金 (6 0 2 72 0 77)
